Reinforced concrete railway-sleeper.



M. BRUKNBR. nnmrononn 001mm RAILWAY SLEEPER. APPLICATION PILED'OOT. 23, 1907.

' 906,686. Patented Dec.15,1908.

l 7:, zzl zeaw fioface thereo slightly concave.

*cretwslegper and as near'as possible to the- UNITED sTArEs PATENT ()FFICE.

MAURICE BRUKNER, OF BllDAPES-l, AUSTRIA-HUNGARY.

nnmrononn CONCRETE AILWAY-SLEEPER.

To all whom it may concern:

Be it known that I, MAURICE BRUKNER, a subiect of the King of Hungary, residing at Bu apest, in the Kingdom. of Hungary, have invented new and useful Im rovements in Reinforced Concrete Railway- Sleepers; and I do hereby declare the following to be a full,-clear, and exact description of the same.

My invention relates to railway sleepers constructed of concrete with iron reinforcement.

Sleepers of reinforced concrete are already known, but those hithertoconstructed did not possess a uniform strength and a sufficient elasticity, were easily cracked and were relativel heavy; moreover the bolts or screws or the rails soon worked loose in them.

The improved sleeper according to the present invention avoids all these drawbacks and possesses the advanta e of being con structed easily, quickly anc cheaply.

My invention relates further to a construction-of the wood wedges embedded in the concrete sleeper by which the wedges can be easily renewed when they are worn out.

The invention is illustrated in the accompanying drawings in which:

Figure 1 shows a plan view of the sleeper. Fig. 2 a longitudinal section of Fig. 1. Fig. 3 is a cross section on the line 3-3 of Fi 1 on an enlarged scale. Fig. 4 is an en ai'ged cross section on the line 4 4 of Fig.- 1. Fig.

5 is an enlarged plan view of the part of the sleeper containing the wood wedges. Fig. 6

is an enlarged bottom view of the opening 1, 2, 1 of the'sleeper.- Fig. 7 is a perspective longitudinal section of the part of the sleeper containing the openingl, 2, 1. Fig. 8 is a perspective View of the three wood wedges in their relative position occupied in thesleeper.

The sleeper has an approximately trapezoid cross section, and the lower width, as to .-be seen in Fig. '3, is about twice as great as the upper width so that a large supporting sui'fac eflisobtained with relatively small weight. For the 4110113 secure laying of the sleeper it is referable to make the under mm In the conup er an under surfaces thereof, are embedde thin iron rods running in the longitudinal direction of the sleeper, while in the interior Specification of Letters Patent.

Application and October 23, 1901. set-111 No. 898,763.

Patented Dec. 15, 1908.

of the concrete body or in the middle part thereof there is no iron. It is advisable to arrange both the u per and the lower groups of rods each in two ayers. At the lower surface of the sleeper there are embedded about twice as many iron rods as in the upper part of the sleeper. The upper rods are indicated in the drawings by the letter aand the lower rods by the letter b-.

The making of the sleeper is effected in a very simple manner because the ironframe forms an easily constructed closed 'whole. The longitudinal bars are so fastened together at iven points by means of the wire binders that astrong frameworkis constructed. For the securing of the rail bolts or screws, use is made of wood wedges, which have the sha e of truntlited pyramids.

lFi h ieference to the left side of Figs. 1 and 2 and to Figs. 6 and 7, the opening in the sleeper receiving the wood wedges is. divided into a prismatic central part 2 and two adljacent pyramidal parts 1, 1 disposed with their smaller ends u wards on both sides of the central part. T e wood wedges are comcentral part 4 (Figs. 5 and 8) placed with its smaller end downwards (see also the right side of Figs. 1 and 2) and oftwo adjacent lateral wedges 3, 3 placed with their smaller ends upwards. The two lateral wedges 3, 3 are previously introduced through the central opening 2 and put in place by pushin them laterally and afterwards the contra wedge 4 is forced in, whereby the lateral wedges are forced against the walls of the openings 1, 1. The wedges are in this way firmly secured in the sleeper and may be tightened whenever necessary. The wedges are held in their place by means of the stirrups 5 bent in the shape of a A, which stirrups are hung by their hooked ends on two of the iron bars band thus prevent any falling out of the wedges from the sleeper. When the wedges should be renewed, the central wedge 4 is pulled out, after which the lateral wedges 3, 3 can be easily removed. To protect the concrete against the strains are provided.

With the arrangement of the parts described the wires are distributed as to be seen sharp bendings so that the strength of the posed of three corresponding parts viz. a

caused by the wedges, preferably hoops 18 from Fig. 1 very uniformly without forming sleeper isqfuite uniform at every point. .At 'the ends 'thes'leeper'preferably wire nets .14 are embeddednear to the surface. 1 Having described gmy invention, what I -13 A reinforcedconcrete sleeperbeing of an-ap'proxlmately trapezoid section and having ,holes'therethroug at right angles to the longitudinal axis thereof," ironrods embedded in the concrete-near to the u per and lower surfaces thereof, wooden we ges removably inserted-in said holes, and means held by said iron rods and adapted to form a support for said wedges. 15 a 2. In a reinforcedconcrete sleeperbeing of an approximately tra ezoid section and hav ing holes therethroug at. right angles to the longitudinal axis thereof, said holes having ',a central prismatic and two adjacent pyra- "iidic parts, wooden wedges fitting each of holes, being composed of a central and iltYO lateral parts of truncated pyra'midic shape fitting res ectively in the said holes, iron rods embedded in the concrete near to the up er and lower surfaces thereof, and means 'eld by said iron rods to form asupport for said wedges.

T 3. In a reinforced mldic concrete sleeper being an a proximately tra ezoid section-Land 130. haying olestherethroug I at right angles to.

the' longitudinal axis thereof, said holes hairing a central prismatic and two adjacent p raarts, wooden wedges fitting eac of said ho es, being composed of a central and two lateral parts of truncated pyramidic shape fittin respectively said holes, iron rods embed ed in the concrete near to the uppcr and lower surfaces thereof, ironi hoops em eddedi in the concrete and surroundin theiwooden wedges, and means held by sai iron rods to form a resting surfacefor said wedges. v

.4. reinforced concrete sleeper being of an approximately tra ezoid section and having oles therethroug at right angles to the longitudinal axis of the same, iron rods embedded in the concrete near-to. the upperv and lower surfaces, a Wooden wedge inserted removably in each hole, and wire nets emsv bedded near the surface of the concrete at the ends of the sleeper, substantially as described. 1

In testimony whereof, I have signed my I name to this specification in the'presence of two subscribing witnesses.

. v URIOE BRUKNER.

Witnesses:

.CnAnLEs Mnssmenn,

EUGENE HARGAMP. 

